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You may already be familiar with the Larson Scanner kit but this project moves a step further. It is an extendable and expandable version of the open-source Larson Scanner, from Evil Mad Scientist Laboratories. Evil Mad Scientist Laboratories modified it a bit with some custom wiring and new code to allow a person to link multiple units together.

This article discuss about power supplies, what a power supply is and about Transformer-based AC/DC converters. Check it out…

A power supply is a device that supplies power to another device, at a specific voltage level, voltage type and current level. For example, when we talk about a 9VDC @ 500mA power supply can provide as much as 500mA of current and the voltage will be at least 9V DC up to that maximum current level.

This article investigate the practical and theoretical fundamentals of electronics. It examines how electrons move and how we measure them; how circuits work and what happens when they fail. You will also learn a bit about LED’s. [via]

This page describes the assembly, programming and use of a device that constantly monitors heart rate and stores the data on an SD memory card. The data can be read from the card, imported into MS Excel (or other programs) for graphing or other analysis. I use this device to track my effort level on bike rides.

This is the part 2 (for part 1 refer here) of a series of articles (hosted @ hackaday.com) about programming AVR microcontrollers. This article discuss the hardware needed to transfer the firmware to the chip and make it run. It talks about simple to build parallel programmer and about professional made programmers. It also introduces a simple test circuit and documents the way to make a led blink.

In this video Nathan Seidle from Sparkfun talks about the beginning of the company on his visit to Google in Mountain View. His talk is very interesting.. check it out

SparkFun Electronics was founded in 2003 by Nathan Seidle. Its first products were Olimex printed circuit boards. The name ‘SparkFun’ came about because one of the founders of SparkFun was testing a development board, and sparks flew out; Fun was chosen because the company’s self-stated aim is to educate people about electronics.